Base or support for photographic sensitive emulsions.



3 UNITED srArEs PATENT orinon.

JAMES FIN DLAY, or iLFORD. nnebaungassicuon TO BBQMAR LIMITED,

or LONDON, ENGLAND.

BASEOR SUPPORT FOR PHOTOGRAPHIC SENSITIVE EMULSIONS;

' Specification of Letters Patent.

, Application filed March 6, 1905. Serial Nat 8,749.

Sensitive Emulsions, of which the to lowing is a specification. v

This invention relates to an lmproved base or support particularly adapted for the reception of photographic sensitive emulsions, films, and the like, the chief object being to produce a base or support having the properties of trahslucency and non-inflammability In preparing films for photographic purposes 1t is usual-to provide a base or support com osed of celluloidan explosive and iighly-ini ammable substancewith a coating of sensitive emulsion, the said base or support in some instances consisting of paper rendered translucent by the application thereto of various varnishes either before or after exposure to light. The inflammability of such films constitutes a grave objection, and the present invention is desi e to obviate or-minimize the risks atten ing the use of films so constructed, and While rendering .the film or base non-inflammable the translucency thereof is obtained without having resort to varnishing. i I

For the purposes of my invention I may proceed in the following manner: For example, I may take a suitable quantity say,

one kilogram-of dinitrocellulose, preferablymade from linen rags or similar suitable substance, or .I mayemploy mononitrocellulose made from any fiber or from paper or other ma terial, such as esparto, and two and one-half kilograms of clear hard gelatin or'glue. To these I add seven and three-fourths kilograms of glacial acetic acid into which ninety i%rams' of crystallized chloral hydrate have een dissolved. The mass is' now slowly heated until the ingredients are thoroughly dissolved. When this is accomplished, I'add to the solution eight liters ofa two-per-c'ent. solution in seventy per cent. alcohol of equal. parts gum-dammar and gum-storax, Havmg been thoroughly incorporated, the mass is poured or deposited upon'suitableslabs or into suitable 'molds to-form sheets, slabs or thin film. The sheets, slabs or film may be 'formed by mechanical or other suitable means, or the mass maybe caused to assume pr coloring-matter with the object o rendermg the same opaque, the coloring-matter be ing in liquid or powdered form.

Patented May 29, 1906..

Although Ihave stated above a mode of carrying out my invention, the proportions of the several ingredients may be varied, according to the character of the base or support required. A For example, by employing about one and one-fourth kilograms of di or mononitrocellulose a clearer, but more ini flammable, fiect is obtained, while if the proportion of gelatin be increased say to two and three-fourth kilogramsa softer film will be obtained. Similarly, by increasing the quantity of glacial acetic acid the film may be rendered more tensile and the chloral h' ployed may be other than hard or clear, with similar results;

The slabs, sheets, or films produced as above described having beefi dr1ed,. the said sheets, slabs, or-films are passed through a solution adapted to impart non-inflammability, the solution being composed of one part gum shellac dissolved in one'partborax or equivalent alkaline 'substancesuch' as ammonia, soda ,,pot'ash'and tenparts water. This'solution may, however, be stronger in alkaline matter; 1

Upon the slabs, sheets, or films being again dried the coating of sensitive emulsion may bea plied; n a

T e molding or otherwise shaping-or form ing of the sheets, slabs, or films may be ac- To' continue, the solution g complished immediately after incorporation or ata subsequently convenient time. Thetreatment of the base or support with the shellac: solution may, moreover, be carried out as and when desired. l. What'I claim, and desire to secure by Letters Patent of the United States, is-

v 1. A non-inflammable 'transparent and white base or support for photographic,sen":v

of dinitrocellu-v sitive emulsions compose lose, gelatin or glue and glacial acetic acid mto which is dissolved chloral hydrate, and

acetic acid into which is dissolved chloralhydrate, gum-d ammar and gum-storax, in or about the proportions given.

3. A non-inflammable transparent and white base or support for photographic sensitive emulsions composed of dinitrocellulose,gelatin or glue and glacial acetic acid into which is dissolved chloral hydrate, and rendered non-inliammable by treatment in an alkaline shellac solution.

4. A method of manufacturing a base or support for photographic sensitive emulsions consisting in adding to a suitable quantity of a nitro derivative of cellulose and gelatin or glue, a solution of chloral hydrate in glacial acetic acid slowly heating the mass until the ingredients are thoroughly dissolved, then adding an alcoholic solution of gum, and then suitably molding or forming the mass into sheets, slabs or films.

5. A method of manufacturing a base or support for photographic sensitive emulsions consisting in adding to a suitable quantity of a nitro derivative of cellulose and gelatin or glue, a solution of chloral hydrate in glacial acetic acid, slowly heating the mass'until the ingredients are thoroughly dissolved, then adding an alcoholic solution of gum, then suitably molding or forming the mass into sheets, slabs or films, and then subjecting the sheets, slabs or films to a suitable solution to impart non-inflammability thereto.

6. A method of manufacturing a base or support for photographic sensitive emulsions consisting in adding to a suitable quantity of nitro derivative of cellulose and gelatin or glue, a solution of chloral hydrate in glacial acetic acid, slowly heating the mass until the ingredients are thoroughly dissolved, then. adding an alcoholic solution of gum, then suitably molding or forming the mass into sheets, slabs or films, and then sub'ecting the sheets, slabs or films to an alkaline shellac solution so as to render said sheets, slabs or films non-inflannnable.

7. A method of manufacturing a base or support for photographic sensitive emulsions,

consisting in adding to a suitable quantity of a nitro derivative of cellulose and a gelatin'ous substani e, a solution of chloral hydrate andglazial acetic acid, then heating the mass until the ingredients are thoroughly dissolved, then adding to the mass a gelatinous solution, and then suitably molding the mass into sheets, slabs or films.

8. A method of manufacturing a base or support for photographic sensitive emulsions, consisting in adding to a suitable quantity of a nitro derivative of cellulose and a gelatinous substance, a solution of chloral hydrate and glacial acetic acid, then heating the mass until the ingredients are thoroughly dissolved, then adding to the mass a gelatinous solution, then suitably molding the mass into sheets, slabs or films, and then subjecting the sheets, slabs or films to an alkaline shellac solution so as to render them non-inflammable.

In testimony whereof I have hereunto set my hand, in presence of tWo subscribing Witnesses, this 24th day of February, 1905.

, JAMES FINDLAY.

Witnesses.

.FRANCIS EDWARD FREETH,

F. J. RAPSON. 

